I've been working on getting a more natural looking coast from the noise functions in a raster program. Here is such an effort:

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It is a combination of a number of gimps standard noise functions and felimage noise at different levels, masked off by coast proximity and large turbulent noise, plus one noise layer motion blurred then masked as well. These are all thresholded and combined by various multiply and screen modes.

Thoughts on the "naturalness" of this?

-Rob A>